<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        label {
            position: relative;
            float: left;
            width: 100px;
            height: 100px;
            border: 1px solid;
            overflow: hidden;
            border-radius: 50%;
        }
        label > span {
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
        }
        input {
            position: absolute;
            left: -50px;
            top: -50px;
        }
        input:checked + span {
            background: pink;
        }
    </style>
</head>
<body>
    <label>
        <input type="radio" name="radio">
        <span></span>
    </label>
    <label>
        <input type="radio" name="radio">
        <span></span>
    </label>
    <label>
        <input type="radio" name="radio">
        <span></span>
    </label>
</body>
</html>
